Double Screw with low noise, Super Silenced Enclosure Elegant compact design. Fully open access door to inner parts for easy service. 100% Continuous duty operation. Load/No Load operation Machine was CE and UL certificated ,Machines under ISO9001 quality management standard system. LCD control panel with easy use and read.PLC control for load/no load and auto shut-off according to the air flow which save much energy. 1 year full machine warranty,3years air end warranty. Progressive Adaptive Control (PAC) Protection continuously monitors key operating parameters and adapts to prevent unexpected downtime V-Shield Technology,provides a totally integrated, leak-free design Sequential Cooling System,significantly improves efficiency, serviceability and noise